The Municipal Workers’ Union of Cachoeirinha (Sindicato dos Municipários de Cachoeirinha – SIMCA) is a union that fights for workers’ rights in class-based struggles in Brazil. Founded on June 20, 1989, it has consistently been a protagonist in struggles both initiated by the Union and by other social movements. The municipal workers of Cachoeirinha have been leaders in the organization and mobilization of these struggles, refusing to stay quiet in the face of arbitrary and authoritarian exploitation of labor, mismanagement on the part of bosses and government officials, and the injustices imposed “from above.”